Senator Claire McCaskill (D-MO), member of the U.S. Senate Committee on Armed Services, joins MSNBC’s Morning Joe and talks with Mike Barnicle about taking her time in analyzing the U.S.-Iran nuclear agreement. “What is it that causes you concern about the Iran deal, that causes you to still be on the fence whether you’ll vote for it or against it?,” asks Mike. Listen to Senator McCaskill’s personal deliberation process leading up to the vote on the agreement here.